Re: [Libusb-win32-devel] application works with older libusb-win32 but not with version 0.1.12.1

[Dan E. <dan...@ne...>]

Graeme Gill wrote:
>
> Stephan Meyer wrote:
> > A configuration value of '0' is invalid (see USB spec
> > for details). So the only solution is to fix your device's
> > firmware.
>
> You're absolutely right, but it doesn't solve the users
> problem, and they can't solve it either, since they
> aren't responsible for creating the device. libusb-win32 looks
> bad if the device used to work, and (presumably) still works
> with other usb drivers.
>
> Is there a way of making libusb-win32 more robust in the
> face of such (badly behaved) devices, rather than simply
> failing ?
>
Having a configuration descriptor with a value of zero is very broken - 
there is no way to select it. When the host issues SET_CONFIGURATION 
with wValue = 0, to select that configuration, the device should enter 
the low power state, and the host should assume that the device has no 
active endpoints.

The library doesn't have  a coherent way of dealing with a device with a 
configuration with value zero, since it keeps track of which endpoints 
are valid to send data on.

What would be your suggestion for a solution?

Dan.